Power actuated hand plane



9 19341 H. u. HEDEBY POWER ACTUATED HAND PLANE 3 Sheeis-Sheet 1 Filed Feb. 8, 1933 INVENTOR ATTO R N EY NW, 6, 1934., H, u. HEDEBY POWER ACTUATED HAND PLANE Filed Feb. 8, 1933 3 Sheets-sheaf, 2

ATTOR N EY WITNESS:

NQV, H U, HEDEBY 1,3 $@,@5@

POWER ACTUATED HAND PLANE Filed Feb. 8, 1935 3 Sheets-Sheet 3 WITNESS- ATTORNEY Patented Nov. 6, 1934 UNITED STATES PATENT OFFICE 3 Claims.

The object of the invention is to provide a hand plane of the motor actuated type in which the motor is free running and disposed over the center of gravity of the tool as a whole and directly supports and drives the chisels or other tools or grinding elements which it is desired to have the device operate; to provide a tool of the kind indicated in which the tool or chisel carrying member has a center of gravity coincident with the 0 center of gravity of the actuating motor and a frictional driving connection with the motor so that in the event of serious obstructions there may be slippage to prevent the tool carrier being arrested without actual stoppage of the motor; to

provide a plane or other similar construction in which the actual cutting or grinding element is readily adjusted to the distance of projection below the lower face of the stock; and generally to provide a tool of the character of a plane which is of simple forth and susceptible of cheap manufacture as compared with the functions it is adapted to perform.

With this object in view, the invention consists in a construction and combination of parts of which a preferred embodiment is illustrated in the accompanying drawings but to which embodiment the invention is not to be restricted. Continued use in practice may dictate certain changes or alterations and the right is claimed to make any which fall within the scope of the annexed claims.

In the drawings:

Figure 1 is a side elevational view of a tool constructed in accordance with the invention.

Figure 2 is a top plan view.

Figure 3 is a sectional view on the plane indicated by the line 33 of Figure 1.

Figure 4 is a sectional view on the plane indicated by the line 44 of Figure 2.

Figure 5 is a rear elevational View.

Figure 6 is a detail sectional view on the plane indicated by the line 66 of Figure 4.

The invention comprises a rotary tool carrying sleeve 10 disposed for rotation at the longitudinal center of the stock 11 which is preferably a metal casting or forging in the form of a flat plate provided on either longitudinal side with an upstanding flange 12. Since the invention is a hand tool, the stock is provided at the rear end with a hand grip 14 and at the forward end with a hand knob 15.

The tool or cutter carrying sleeve 10 is carried by the rotor 16 of an induction motor, this rotor being of the squirrel cage type but of ring form and it is disposed in surrounding relation to the stator 17 which is keyed to and carried by a. stationary shaft 18 on the central shouldered portion of the latter. The shaft 18 is formed with reduced terminal externally threaded portions 19 and 20 which extend through central openings in the closed end of the motor casing 21 and the end case cover 22 respectively. In order that the rotor may be properly supported with respect to the stator, roller races 23 and 24 are provided, these being mounted upon and keyed to reduced shoulder portions 25 and 26 of the shaft, the race 23 having a hub portion 27 which enters a counterbore in the end wall of the casing 21 to which it is keyed. The end case 22 is formed with a lip 28 which abuts the inner periphery of the case 21 and is also formed with holes or openings into which the pins 29 fixed on the end of the case extend. The lip 28 and pins 29, thus serve to center the end case on the casing or housing 21 and when the wing nut 30 is attached to the threaded end 20 of the shaft 18, the end case is retained in place, since the threaded end 19 0f the shaft receives a nut 31 which secures the shaft in the end wall of the case 21.

The keyed connections between the races 23 and 24 and the shaft 18, the similar connection between the stator and the shaft and the keyed connection between the race 23 and the closed end of the case 21, maintain a stationary relationship between all of these parts.

Disposed in surrounding relation to the races 23 and 24 are the rollers 32, arranged in circular series, each series of rollers being surrounded by an outer race of which the two indicated at 33 and 34 are secured together by axial bolts 35 in gripping relation to the rotor ring which they abut on the end faces of the latter, the bolts 35 passing through axial holes formed in the laminae constituting the core of the rotor.

The race 33 is formed with a peripheral radially extending flange 36 against which one end of the tool cylinder or sleeve 10 abuts, the tool sleeve being disposed in snug fitting engagement with the outer peripheries of the races 33 and 34 100 but nottoo snug to prevent slippage between it and said races. The tool cylinder is retained in position on the races and in abutting engagement with the flange 36 by small clip plates 3'7 mounted in seats in the outer face of the race 34 and 105 removably secured in said seats by means of screws 38. The clip plates thus act to prevent any axial movement of the tool cylinder or sleeve.

The tool cylinder is thickened, as indicated at 39, at uniformly spaced points around the pe- 110 riphery thereof and these thickened portions are formed with axial slots disposed in planes substantially tangential to the periphery of the tool cylinder, so that they may receive the cutters or chisels which are retained in their positions in the seats by means of screws 41.

If the invention be employed for routing or similar operations requiring a chisel of peculiar shape on the cutting edge, such chisels or cutters may be substituted for the chise s 40, or if the invention be used for grinding operations, the cylinder 10 may be provided with the appropriate abrading surface.

The motor housing has a hinge or swinging connection 42 with the stock 11, this swinging connection being to one side of the axis of rotation of the motor, on the opposite side of which axis of rotation, the case is provided with the slotted ears 43 into the slots of which the clamp screws 44 may be swung, the clamp screws having swinging connections 45 with the stock and being provided with seat nuts/46 below the ears 43 and wing nuts 47 above the ears. Obviously tightening the wing nuts 47 effects gripping of the ears 43 between them and the seat nuts 46, so that this connection together with the hinge connections 42 effects a fixed mounting of the mot-or and a fixed axis of rotation for the tool cylinder.

Adjustment of the seat nuts 46 on the screws 44 determines the horizontal plane of the axis of rotation of the rotor and thus will determine the extent of projection of the cutting edges of the chisels or tools 40 below the plane of the bottom face of the stock, the bottom wall of the stock in this region being cut through as indicated at 48 to provide clearance space for the chisels.

The flanges 12 in the region of the motor housing are formed with slots 49 and transverse flanges 50 which span the stock to the front of and behind the motor housing are similarly formed, these slots providing openings for the ejection of chips or other waste resulting from the operation of the tool cylinder.

The lower edge of the motor housing 21 and end case 28 fall below and within the upper edge of the flanges 12 when the casing is clamped in position on the stock by the clamp screws 44. When the clamp screws are released, however, and swung back out of engagement with the cars 43, the motor casing or housing may be swung up on its hinge connections for adjustment of the cutter or chisel blades 40 from the under side of the housing, or for the removal of the end case 22 after the wing nut 30 has been detached.

The motor illustrated is of the induction type and, if used with single-phase current, will have the stator 17 provided with a split-phase winding to effect starting. Used with any multi-phase system. however, the stator will carry a two or three phase winding as required.

The motor control is disposed in a convenient position to the hand grip l4 and consists of a switch enclosed in a housing 51 with an exteriorly exposed push button 52 arranged for pressure by a finger of the hand engaging the hand grip 14. The housing 51 is removably secured to the motor case 21 and the line conductor .53 enters it from the top. Connection between the switch and the motor stator is effected by conductors housed in a compact conduit 54 secured to the motor casing and leading from the switch housing to the rotor.

The invention having been described, what is claimed as new and useful is:

1. A tool of the character indicated comprising a stock, a casing mounted upon the stock and permanently closed at one side but having a removable end case cover at the other side, a stationary shaft disposed centrally in the casing and secured in the closed side thereof, a motor stator mounted upon said shaft and fixed thereto, a rotor disposed in surrounding relation to the stator, means for rotatably supporting the rotor from said shaft including anti-friction bearings, and a tool carrying member encircling the rotor, the shaft projecting through the end case cover and being terminally provided with a. wing nut for bearing on said cover to retain it in closed position.

2. A tool of the character indicated comprising a stock, a casing mounted upon said stock, a stationary shaft mounted in said casing, a motor stator mounted upon and keyed to said shaft to fixedly position it with respect thereto, races keyed to said shaft at opposite ends of said stator and being of substantially the same radial extent as the latter, a rotor disposed in surrounding relation to the stator, races disposed at opposite ends of the rotor and in surrounding relation to the first said races, rollers interposed between the first and second said races, axially arranged bolts passing through the rotor and through the second said races to clamp the latter into engagement with the rotor and thus support the latter, and a tool carrying sleeve encircling the rotor and seated upon the second said races.

3. A tool of the character indicated comprising a stock, a casing mounted upon said stock, a stationary shaft mounted in said casing, a motor stator mounted upon and keyed to said shaft to fixedly position it with respect thereto, races keyed to said shaft at opposite ends of said stator and being of substantially the same radial extent as the latter, a rotor disposed in surrounding relation to the stator, races disposed at opposite ends of the rotor and in surrounding relation to the first said races, rollers interposed between the first and second said races, axially arranged bolts passing through the rotor. and through the second said races to clamp the latter into engagement with the rotor and thus support the latter, and a tool carrying sleeve encircling the rotor and seated upon the second said races, one of said races being peripherally flanged to act as an abutment for one end of the sleeve and the corresponding race having clip plates removably secured thereto and abutting the other end of the sleeve.

HANS U. HEDEBY. 

